That should have set the system back to factory which is good.
But this problem if still present is in the Dolby sens circuit portion of the system.
This will requre some good electronics experience as well as the ability to read and understand electronic schematics to fix this. I have found the problem most times on this system to be a transistor NPN type switching that is no longer sending the correct command in response to the signal.This will require an experienced tech.
If you have this experience and the tools I can go further with you;-)
If not your best way to have this fixed is Sears home service or even a local sears as many of them will perform this repair, also Best Buy does these as well but they all send it out. Those two are reasonable and very good art this repair.
Also you can check around if you have a local home audio shop many of them will make repairs now a days.
Let me know what you would like to do, I'm here if you need me.
Please rate my service kindly before you go, it doesn't cost you anything and then you can contact me anytime until we are done.